Electrically heated compound molding machine

ABSTRACT

An electrically heated compound molding machine for molding cap liners in place. The machine has an electrically heated ring for controlling the temperature of an upper die element within narrow limits. The particular thermostat control element limits the upper die temperature to within narrow confines. Radiant heat is used to heat the lower die members.

United States Patent Armstrong et al.

[4 1 Jan, 18, 1972 [54] ELECTRICALLY HEATED COMPOUND MULIDING MACHINE[72] Inventors: Thaddeus J. Armstrong, Elmwood Park;

Jon Ohlhaver, Deerfield, both of I11.

Continental Can Company, Inc., New York, NY.

[22] Filed: Mar.24, 1969 [21] Appl.No.: 809,898

[73] Assignee:

[5 2] US. Cl. ..425/112, 425/144 [51 llnt. Cl. ..B29c 3/02 [58] Field ofSearch ..18/20 C, 20 G, 20 R, DIG. l3,

18/5 R, 38, 5 BH,12 SJ, 5 E, 5.3 H, 30 HB, 16.5; 249/78; 136/200, 201,230

2,719,326 10/1955 ..18/30 I-IM Dykehouse 2,774,107 12/1956 Davis ..18/12SJ 3,050,575 I 8/1962 Sullivan .....136/230 3,407,442 10/1968 Wright..18/20 G 1,541,358 6/1935 Johnson... ..18/16.5 UX 2,508,988 5/1950Bradley 18/30 l-lB X FOREIGN PATENTS OR APPLICATIONS 1,141,422 12/1962Germany ..18/20 C Primary Examiner-H. A. Kilby, Jr. Attorney-AmadeusMitchell, Joseph E. Kerwin and William A. Dittmann [57] ABSTRACT Anelectrically heated compound molding machine for molding cap liners inplace. The machine has an electrically heated ring for controlling thetemperature of an upper die element within narrow limits. The particularthermostat control element limits the upper die temperature to withinnarrow confines. Radiant heat is used to heat the lower die members,

10 Claims, 11 Drawing Figures PATENTED JAN: 8 m2 SHEET 1 0F 5 IN VENTORSARM PATENTED m a a 29 2 SHEET 2 UP 5 'I' II I N VE N TORS I ll 'l 1 Illlllllll I ll] |h\ THADDEUS J ARMSTRONG JON OHLHA VER BY 6 MW ATT'Y.

PATENTED JAN! 81972 SHEET 3 OF 5 INVENTORS THADDEUS J ARMSTRONG JON OHLHAVER PATENTEDJMHBEYZ 3.635.619

sum u UF 5 I N VE N TORS THA DDEUS J ARMS TRONG JON OHL HA VER Jh ATT'YPmmmmmezz 363519 SHEU 5 UF 5 I N VENTOFrS THA DDEUS J. A RMS TRONG JONOHL. HAVE 1? ELECTRICALLY HEATED COMPOUND MOLDING MACHINE This inventionrelates to the forming or molding of plastic materials, and moreparticularly, to improvements in a heated molding machine for in-placemolding of resin compositions, such as the thermosetting materials usedas an inner liner for a container closure cap or a similar article toprovide a resilient gasket for the seal between the closure cap and thebottle, jar or the like.

This apparatus is essentially an improvement of the apparatus embodiedin the patent application entitled Machine for ln-Place Molding of CapGaskets," by Norbert L. Wright, U.S. Pat. No. 3,407,442, and assigned tothe assignee of the present invention.

It is a general object of the present invention to simplify and improvethe construction and operation of the machine referred to in the abovepatent.

It is another object of the invention to provide a machine having fewerelements.

It is another object of the invention to provide a machine having aquick startup time.

It is another object of the invention to provide a machine havingexcellent heat-transfer characteristics and responsive heat control.

It is a final object of my invention to provide a machine having easierdisassembly and access for repair.

These and other objects and advantages of the invention will becomeapparent from a consideration of the molding machine which is shown byway of illustration in the accompanying drawings and more clearlyunderstood by reference to the following detailed description wherein:

FIG. I is a plan view of my machine for molding cap liners havingportions of the machine broken away for a clearer view.

FIG. 2 is a side elevation of my machine with portions broken away.

FIG. 3 is a partial vertical section to an enlarged scale of an upperand lower clamp member and the lower heater assembly taken from theopposite side as FIG. 2.

FIG. 4 shows a part of my machine showing the ring support member.

FIG. 5 shows an upper heater element.

FIG. 6 shows a lower heater element.

FIG. 7 shows a top view of the ring support member.

FIG. 8 is a sectional view of an upper clamp member at the thermalcontrol station on the periphery of the turret.

FIG. 9 is an exploded perspective view showing the upper molding diesupport plug and clamp member.

FIG. 10 shows the thermocouple tip and thermocouple support element.

FIG. 11 shows the fragmentary section to an enlarged scale through theskirt of a cap shell prior to the molding operation.

FIG. 12 is a view similar to FIG. ll after the molding operation and theplastic is in its final position.

As described in the accompanying figures, this device is, in mostessentials, very similar in its operation and structure to the devicereferred to in the above-mentioned patent to N. I... Wright, U.S. Pat.No. 3,407,442.

FIG. 1 shows the upper heater ring 1 underneath the turret 2. This upperelectrical heater ring is attached to the turret and rotates with theturret. An appropriate number of slip rings are mounted on the axis ofthe turret and cooperating rings. In this way, power is supplied to theelectric heater. The cover 3 is shown surrounding about three-fourths ofthe turret 2 which rotates inside the cover 3. Part of the turret isbroken away to show caps 4 being passed into and out of the turret.These caps 4 are fed from a wheel pocket 5 in the wheel turret 6 andafter having been processed, are taken away by another wheel turret 7for further operations. The spindle operating elements of the individualstations of the turret are lubricated by a pump 8 shown interiorly ofthe turret and oil is conducted through a lubricant supply line 9 to thenecessary points on the turret. A belt 10 or similar conveyance bringsunprocessed caps 11 to the machine and takes the processed caps 12 fromthe machine.

A cross section view of the machine is shown in FIG. 2. A cross sectionof one of the stations 13 in side elevation shows most of the movingparts. The turret 2 is rotatably mounted on a shaft 14 which extendsfrom the center of the base machine 15 upwardly. The turret has a shapesomewhat similar to a bowl having a lip 16 around its upper rim.

Suspended from the upper lip 16 is shown a cross section of the upperheater ring 11 which is hung beneath the outer section of the turret.The heater ring 1 extends completely around the turret 2 and thetemperature of the heater ring is controlled by the amount ofelectricity fed into the ring in response to the temperature of theupper molding die 26 and to a lesser extent, the cap and lower punchassembly llh. Two pairs of heater elements 19, 20 extend completelyaround the ring. These heater elements are connected to an externalpower source through slip rings. The amount of electricity conducted toand through the electric heater is controlled by a thermostat whichresponds to the level of the temperature in the molding die or punch 21.When the temperature of the thermostat is above a certain level, thethermostat stops the flow of electricity to the upper heater ring l andwhen the temperature of the thermostat is below a certain level, thethermostat starts the flow of electricity to heat the upper heater ringll until the thermostat cutoff works as described above.

A thermostat, not shown, regulates the temperature of the lower clampinglifting member to about the same temperature as the punch. This assemblyradiates heat to the lower clamp assembly, thereby keeping it at atemperature near the curing point of the plastic being used in the caps.

As shown in the drawing, the entire area may be covered by a shield 22to protect against flying debris, dust and air currents.

Turning now to a closer view of the upper and lower punch assemblies l7,118, from a different view, FIG. 3 shows the lower punch assembly 18 andan upper punch assembly 117 having a single compression spring 23 withtwo paired pins 24, 25 slidable between the punch assemblies 117, 18 tokeep proper orientation and distance between the assemblies so that thepunch assembly or die punch 26 enters the cap at a proper place to pressdown the plastic material located around the inside of the cap. Thecompression spring 23 imparts an upward force to the upper heat transferelement 27. Above the die or punch 26 is shown the upper thermaltransfer element 27 which operates as a heat sink since it is of a muchmore dense material than the heater ring 1. In this way, as heat isextracted from the die or punch and passed into the ambient atmosphereand the plastic material and the cap material, this heat willmomentarily lower the temperature of the die or punch 26 somewhat, butwhatever heat is lost is quickly restored by the upper thermal transferelement 27 which has a high heat capacity. The rate of heat flow throughthe upper thermal heat-transfer element 27 is relatively slow incomparison to the rate of heat transferred through the heater ring I.The heater ring is made of a material having a high heattransfercapacity, such as aluminum. In this way, when electric potential isapplied to the resistors 19, 20 in the heater ring, the temperature ofthe resistors will rise rapidly and this heat is transmitted to the ringmaterial. The ring is made of a material having a high rate of heatconductivity, such as aluminum. From the heater ring, heat is passedinto the upper thermal transfer element.

The upper thermal transfer element 27 is made of a material having thecharacteristics of high heat capacity per cubic centimeter and arelatively low rate of heat conductivity, for example, steel. Because ofthese two characteristics, it acts as a heat sink or thermal storageplace. The heat sink provides a buffer and a heat-equalizing region sothat the heat supplied by the heater ring on one side and the heatflowing out of the punch on the other side do not cause wide swings inthe overall temperature of the upper punch assembly. Heat travels aboutsix times as fast in aluminum as in the upper steel heat transferelement.

The lower forming assembly is controlled in about the same manner as theupper assembly in that one or more thermostats are located around itsperiphery and as the upper turret turns, the lower assembly is heated byheater elements located in the lower heater assembly 28. A thermostat(not shown) located at the lower assembly calls for more or less heat asthe situation demands, and keeps the lower assembly within a temperaturerange of to of about 425 F., depending on the plastic heat-curablematerial used for the gasket.

Shown in FIG. 4 is a plan view of details of the heater support ring 29found in FIGS. 1 to 3, inclusive. This support ring 29 has diagonalslots 30 in it so that the lower heater supporting elements 31 (FIGS. 2and 3) are mounted in these diagonal slots 30 and may be moved from aposition of about one-sixteenth inch away from the lower die or punchassembly to several inches away. This slot arrangement facilitatesrepair work of the turret and lower support structure because when thelower heating ring 28 is moved backward several inches, access to thelower structure is more readily possible. The supporting means 29 ismounted on posts 32. In order to render access to the interior of themachine even more easy, the posts on each side are of a simple snapinremovable-type support. When one or two of these supports are removed,the heater support ring is then held up by the other four or fivesupports shown in the figures. These four rearmost supports are fastenedtop and bottom so that elimination of any one support is not fatal tothe function of the ring.

The upper heating ring 1 is shown in perspective view in FIG. 5.Terminals for conducting electricity into and out of the heater ring 1are connected so that the two pairs of inner terminals 33,34 connect tothe resistors 19 shown at the inside of the ring. The two pairs of outerterminals 35, 36 connect to the outer resistors 20. As shown best inFIGS. 3 and 5, the electric terminals conduct electricity into theresistor elements 19,20 cast into the aluminum ring 1. The thermal rateof conductivity of aluminum is quite high. The aluminum heater ring 1conducts heat from the resistors quite rapidly. Passages 37 shown in theheat ring pass completely through the ring to accommodate the shafts 38of the molding ele ments (FIG. 3) shaft 38 is held in tension by apreloaded compression spring 48 which is mounted in spring cartridge 49.The heater elements I9,20 pass inside or outside of the passages 37.

A pair of lower heating elements 28 are mounted about the lower punchassembly 18. One of the two lower heaters 28 is shown in FIG. 6. Severalresistor elements 39 conduct electricity and develop heat. Behind theresistor elements are heat reflectors 40 to divert any heat rays forwardtoward the lower assembly. While the heat radiated by these heaterelements 28 is of considerable criticality in the forming of the plasticring, it is not quite as critical as the amount of heat developed in theheater ring because the upper die or punch is in physical contact withthe plastic ring and therefore, the heat imparted to the plastic orplastic disc 41 (FIG. 12) from the upper die or critical punch 26 is ofmore consequence to its forming.

FIG. 7 shows the support ring 29 itself as it is seen without anyfastenings. On the right and left are paired slots 30 for supporting thelower heating semicircular elements 28 so that these elements can bemoved into and out of proximity with the lower heated die assembly 18.When the lower heater is moved forward in the slots, it is aboutone-sixteenth inch from the lower die assembly.

In an apparatus of this sort, the level of the temperature of the upperand lower dies is critical. If the temperature of the die is too high,the plastic inside the cap will burn and stick to the punch. If, on theother hand, the temperature of the die is not high enough, the plasticmaterial will not flow to form the desired sealing contact all the wayaround the cap (FIGS. 11 and 12). A temperature range at which theplastic will work satisfactorily is on the order of 410 to 425 F. Someplastic materials may be cured in a broad range of temperatures, such as300 to 500 F. In the usual factory operating conditions, a variety ofinfluences play upon a machine. For example, it

may be summer, winter, raining, high humidity, low humidity, or drafty.Each of these variable atmospheric conditions affects the rate at whichheat flows from the machine and thus affects heat distribution throughthe machine. It is necessary for the heat to be at a very precise levelof temperature at the point where the die 26 or punch forms the plasticin the cap. Since the various atmospheric efl'ects play upon eachstation of the turret with approximately the same result at eachstation, a very good control can be accomplished by having one thermalcontrol point at a single upper punch 26 on the periphery of the turret2. Such a thermal control point is established at the station shown incross section in FIG. 8. The heater ring 1 with its paired resistanceelements is mounted to the top element 2 (FIG. 3) shown and below thatand pressed into contact with it is the upper thermal transfer element27 which forms a heat sink. Shown on the left-hand side of the upperthennal transfer element 27 is a plug 42 (FIG. 8) extending through theupper thermal transfer element. This plug is made of a material having ahigh thermal conductivity. A perspective view of the upper thermaltransfer element 27, the punch 26, the thermal plug 42, and the locatorpins 24, 25 shown in FIG. 9.

The details of the thermal plug and the thermocouple combination areshown in FIG. 10. The plug 42 is shown before it is driven into theupper element 27 in FIG. 8.

While it is out of the assembly, the thermocouple 45 is pushed down intothe plug 42 where it snaps into place. The plug has slits 44 almost halfof its length in four perpendicular directions. This facilitates latercrimping of the plug when it is forced into the upper thermal transferelement 27. When the thermal plug 43 has been driven into the thermalelement, the thermocouple 45 is located fairly close to the die or punch26. In this way, temperature gains or losses of the die or punch arereflected into the heater ring much more quickly than would be the caseif the thermal plug was of a material which conducted heat slowly. Theamount of heat added to the heater ring in order to bring the die orpunch up to the given temperature is lessened. Thus heater plug 42 is athermal connection between the heater ring and the die or punch so thatthe extent of the temperature swings of the die or punch areconsiderably lessened by means of the thermally conductive bridge formedby the thermal plug.

The method of forming the thermal plug with included thermocouple is ofparticular interest. The thermal plug 42 is made of a highly conductivematerial in the form of a cylindrical plug having a channel 46 throughits center. The plug is flat at its ends and is slit 44 up one-third toone-half of the way, the slit being in the form of an X. Once thethermocouple 45 is inserted into the thermal plug 42, the thermal plugmay be pressed together so that the thermocouple element 45 is caught inthe bottom of the thermal plug 42. When the thermal plug is shoved upinto the upper thermal transfer element, it makes a tight fit whichholds it in place.

The function of the upper heat transfer element 27 is twofold. It actsas a heat sink and also since it is made of a very strong material, thefour locator pins 47 center the cap in a very precise position. If thematerial were made of other than steel or the like, a locator fingermight bend, and this would result in an immediate malfunction of themachine. Further, this element is capable of being smoothed to a highdegree and may have high contact pressure with the aluminum heater 1.Because of the density of the material in the heat sink and the slowrate at which heat flows through this material more heat is accumulatedper cubic centimeter in the material of the heat sink than is in thealuminum heater ring. By means of having an intermediate heat sink,greater stability is assured to the temperature of the punch member.Since the heater ring may swing widely in temperature, the buffer" heatsink protects the punch and consequently, the cap member from thetemperature swings of the heater ring and insures a considerably greaterstability to the plastic material and the punch which heats it.

While particular materials and specific details of construction havebeen referred to in describing the form of the machine illustrated, itwill be understood that other suitable materials and equivalentstructural details may be resorted to without departing from the spiritof the invention.

We claim:

1. An electrically heated compound molding machine for inplace moldingof cap liners comprising:

a liner curing turret mounted for rotation on a vertically disposedaxis;

clamp punch assemblies mounted on the turret for receiving caps having apredetermined quantity of thermally curable material therein;

means for feeding the caps to successive clamp assemblies as the turretrotates about its axis;

upper clamping members of said assemblies being mounted in fixedposition on the periphery of said turret and having a die elementadapted to fit snugly into said cap to shape the thermally curablematerial in said cap into a liner disc on the cap bottom and cap skirtwhen the clamping members are closed together;

first heating means having a thermal capacity much less than said upperclamping members and mounted adjacent said upper clamping members andbetween said clamping members and said turret for imparting heat bydirect conduction to each said upper clamping member whereby each saidupper clamping member acts as a heat equalizing means between saidheating means and said die element;

lower clamping members mounted for vertical reciprocation in a bore in asupport member whereby operating means causes vertical reciprocation ofsaid lower member to open and close the clamping members for receivingand discharging the caps;

second heating means mounted near said lower clamping member andextending almost around said turret and said clamp assemblies forimparting heat to said lower clamping member; and

thermal control means having a heat sensitive element for intermittentlysending current to said first and second heating means whereby saidupper and lower clamping members are maintained at a temperature nearthe curing temperature of said thermally curable material.

2. An electrically heated compound molding machine for in-place moldingof cap liners as set forth in claim 1 in which said first heating meanscomprises:

a ring-shaped member made of material having higher thermal conductivityand lower specific heat than said upper clamping member and said dieelement;

resistance elements embedded in said ring-shaped member;

and terminal elements connected to said resistance elements wherebyelectricity is conducted to and from said resistance elements.

3. An electrically heated compound machine for inplace molding of capliners as set forth in claim 1 in which said upper clamping membercomprises:

an upper thermal transfer element having higher specific heat than saidfirst heating means and mounted adjacent to and in close contact withsaid first heating means whereby heat is transferred by conduction fromsaid heating means to said thermal transfer means; and

said die element being mounted adjacent to and in close contact withsaid upper thermal transfer element whereby heat may be transferredbetween said upper thermal transfer element and said die element.

4. An electrically heated compound molding machine for in-place moldingof cap liners as set forth in claim It in which said upper thermaltransfer element comprises:

a base member having four locator pins extending downwardly from saidbase member for centering a cap on said lower clamping member.

5. An electrically heated compound molding machine for in-place moldingof cap liners as set forth in claim 3 in which said thermal controlmeans for said first heating means comprises:

a thermal plug made of a material having high thermal conductivity andfitting snugly into a passageway extending through said upper thermaltransfer element between said die element and said first heating means;

a heat-sensitive element in said plug for determining the temperature ofa part of said plug; and

electrically conductive leads extending from said heat-sensitive elementfor conducting electrical information as to temperature level from saidheat sensitive element whereby the amount of heat generated in saidfirst heating means is controlled by the temperature of saidheatsensitive element.

6. An electrically heated compound molding machine for in-place moldingof cap liners as set forth in claim 5 and having, additionally,

ring support means for suspending said second heating means; and

removable support elements attached to said support ring for maintainingsaid support ring in position.

7. An electrically heated compound molding machine for in-place moldingof cap liners as set forth in claim 5 in which:

said heat-sensitive element in said plug is located near said dieelement.

8. An electrically heated compoundl molding machine for in-place moldingof cap liners as set forth in claim 6 in which said support ring meanscomprises:

a flat sector of over half a circle having slots therein; and

connecting means mounted in said slots for supporting said second heatermeans whereby said second heater may be slid from a position near saidlower clamping members to a position remote from said lower clampingmembers.

9. An electrically heated compound molding machine for in-place moldingof cap liners as set forth in claim 1 in which said second heating meanscomprises:

an arcuate heater element mounted around said lower clamping members forimparting heat to said lower clamping members and having resistanceheating means extending along the length of said arcuate heater element;and

reflector means extending along the length of said re sistance heatingmeans and mounted on the opposite side of said resistance heating meansfrom said lower clamping members whereby heat given off by saidresistance heating means is reflected by said reflector means towardsaid lower clamping means.

10. An electrically heated compound molding machine for in-place moldingof cap liners as set forth in claim 1 in which:

a bolt having a compression spring mounted under its head is threadedinto said die and the compression spring under its head rests againstthe upper part of said turret for fixedly mounting said die and upperclamping means on said turret.

1. An electrically heated compound molding machine for in-place moldingof cap liners comprising: a liner curing turret mounted for rotation ona vertically disposed axis; clamp punch assemblies mounted on the turretfor receiving caps having a predetermined quantity of thermally curablematerial therein; means for feeding the caps to successive clampassemblies as the turret rotates about its axis; upper clamping membersof said assemblies being mounted in fixed position on the periphery ofsaid turret and having a die element adapted to fit snugly into said capto shape the thermally curable material in said cap into a liner disc onthe cap bottom and cap skirt when the clamping members are closedtogether; first heating means having a thermal capacity much less thansaid upper clamping members and mounted adjacent said upper clampingmembers and between said clamping members and said turret for impartingheat by direct conduction to each said upper clamping member wherebyeach said upper clamping member acts as a heat equalizing means betweensaid heating means and said die element; lower clamping members mountedfor vertical reciprocation in a bore in a support member wherebyoperating means causes vertical reciprocation of said lower member toopen and close the clamping members for receiving and discharging thecaps; second heating means mounted near said lower clamping member andextending almost around said turret and said clamp assemblies forimparting heat to said lowEr clamping member; and thermal control meanshaving a heat sensitive element for intermittently sending current tosaid first and second heating means whereby said upper and lowerclamping members are maintained at a temperature near the curingtemperature of said thermally curable material.
 2. An electricallyheated compound molding machine for in-place molding of cap liners asset forth in claim 1 in which said first heating means comprises: aring-shaped member made of material having higher thermal conductivityand lower specific heat than said upper clamping member and said dieelement; resistance elements embedded in said ring-shaped member; andterminal elements connected to said resistance elements wherebyelectricity is conducted to and from said resistance elements.
 3. Anelectrically heated compound machine for in-place molding of cap linersas set forth in claim 1 in which said upper clamping member comprises:an upper thermal transfer element having higher specific heat than saidfirst heating means and mounted adjacent to and in close contact withsaid first heating means whereby heat is transferred by conduction fromsaid heating means to said thermal transfer means; and said die elementbeing mounted adjacent to and in close contact with said upper thermaltransfer element whereby heat may be transferred between said upperthermal transfer element and said die element.
 4. An electrically heatedcompound molding machine for in-place molding of cap liners as set forthin claim 3 in which said upper thermal transfer element comprises: abase member having four locator pins extending downwardly from said basemember for centering a cap on said lower clamping member.
 5. Anelectrically heated compound molding machine for in-place molding of capliners as set forth in claim 3 in which said thermal control means forsaid first heating means comprises: a thermal plug made of a materialhaving high thermal conductivity and fitting snugly into a passagewayextending through said upper thermal transfer element between said dieelement and said first heating means; a heat-sensitive element in saidplug for determining the temperature of a part of said plug; andelectrically conductive leads extending from said heat-sensitive elementfor conducting electrical information as to temperature level from saidheat sensitive element whereby the amount of heat generated in saidfirst heating means is controlled by the temperature of saidheat-sensitive element.
 6. An electrically heated compound moldingmachine for in-place molding of cap liners as set forth in claim 5 andhaving, additionally, ring support means for suspending said secondheating means; and removable support elements attached to said supportring for maintaining said support ring in position.
 7. An electricallyheated compound molding machine for in-place molding of cap liners asset forth in claim 5 in which: said heat-sensitive element in said plugis located near said die element.
 8. An electrically heated compoundmolding machine for in-place molding of cap liners as set forth in claim6 in which said support ring means comprises: a flat sector of over halfa circle having slots therein; and connecting means mounted in saidslots for supporting said second heater means whereby said second heatermay be slid from a position near said lower clamping members to aposition remote from said lower clamping members.
 9. An electricallyheated compound molding machine for in-place molding of cap liners asset forth in claim 1 in which said second heating means comprises: anarcuate heater element mounted around said lower clamping members forimparting heat to said lower clamping members and having resistanceheating means extending along the length of said arcuate heater element;and reflector means extending along the length of said resistanceheating means and mounted on the opposite side of said rEsistanceheating means from said lower clamping members whereby heat given off bysaid resistance heating means is reflected by said reflector meanstoward said lower clamping means.
 10. An electrically heated compoundmolding machine for in-place molding of cap liners as set forth in claim1 in which: a bolt having a compression spring mounted under its head isthreaded into said die and the compression spring under its head restsagainst the upper part of said turret for fixedly mounting said die andupper clamping means on said turret.